sellon



(No Model.) 2 Sheets-Sheet 1.

J. S.- SELLON.

AUTOMATIC SWITCH FOR SECONDARY BATTERIES.

No. 384,289. Patented June 12, 1888.

' g wmmoz.

W mum/W N PEYERs. Phoko-Lllhognphcn Walkinglcn. D C,

(No Model.) 2 Sheets-Sheet 2.

J. S. SELLON.

AUTOMATIC SWITCH FOR SECONDARY BATTERIES.

No. 884,289. Patented June 12, 1888.

lllll 'g.

UNITED STATES PATENT OrricE.

JOHN S. SELllON, OF HATTON GARDENS, COUNTY OF MIDDLESEX, ENGLAND, ASSIGNOR TO THE ELECTRICAL AOOUM ULATOR COMPANY, OF NEXV YORK.

AUTOMATlC SWITCH FOR SECONOARY BATTERIES.

SPECIFICATION forming part of Letters Patent No. 384,289, dated June 12, 1888.

Application tiled August 30, 1587. Serial No. 28,262.

(No model.) Patented inEngland January 13, 1883, No. 217; in France June 10, 1833, No. 156,156, and in Germany July 17, 1853, No. 27,868.

To aZZ whom it may concern.-

Be it known that 1, JOHN Soomnonn Sun LON, a subject of the Queen of- Great Britain and Ireland, and a residentof Hatton Gardens,

in the county of Middlesex, England, haveinvented certain new and useful Improvements in Automatic Switchesfor Secondary Batteries, (for which I have obtained Letters Patent in Great BritaimNo. 217, dated January 13, 1883;

in Germany, a. 27,868, dated July 17, 1883, and in France,No. 156, 156,datcd..luue 20,1S8fl,) of which the following is a specification.

My invention consists in an arrangement of apparatus for automatically dividing an elec- 5 trical circuit containing a primary generator and a secondary battery into two electrically independent circuits, and for again uniting such circuits into one undivided circuit, which operations both follow predetermined changes in the electrical condition of the circuit or circuits.

I provide an clcctro-magnct having two substantially equal windings. ln circuit with one winding is a circuitlneaker operating to make 5 and break the charging-circuit. The circuit breaker, when operated, introduces a resistance into the circuit, said resistance being in two or more sections, which are successively introduced through the medium of a mercury- 3 cup and a series of contacts operating therein, each contact being of a different length from either of the others. The second coil of the magnet is in circuit with an artificial rcsistanee, which is approximately a compensation 55 or equivalent for the secondary battery to be charged. The introduction and withdrawal of this resistance is accompanied by the use of a sectional resistance operated upon by means of a circuit-changer like that described with 4 reference to the first coil. \Vhen this magnet is operated to break the charging circuit the other coil thereof is included in circuit, with the dynamo and the resistance, and would therefore immediately resume itsfirst position under the intlnence of the current tlowing therein, but for the fact that it is caught and held by a tilting-arm controlled by two electromagnetic coils of high resistance having the form of solenoids. One of said coils is con nected in position to indicate the electro-mo- 5o tive force due to the dynamo, the other that of the battery. When the clectro-motive force of the dynamo rises above that of the battery, the action of the magnets, which is differential with respect to each other, is to release the tilting-arm and allow the switch to close the chargingcircuit, simultaneously breaking the circuit containing the artificial resistance.

The accompanying drawings illustrate my invention.

Figure 1 shows the magnets, resistances, and elcctro-motivc-forcc measu rcrs arranged upon a backboard in operative relations. Fig. 2 shows the apparatus applied to a chargingcircnit containing dynamo and accumulators.

M M is an clectromagnet having two windings or coils of wire, 'W and W. A and B are bars of conductingmaterial sliding in thebearings :0 and l respectively.

Near the lower ends of A and B are cups T and T containing mercury. Upon the lower ends of A and B there are disks from which project metallic contacts of different lengths, rcspccti vely, i nsulated from each other, as shown. Each contact is connected to a different point in the artificial resistance r or r. Angle-bars, as shown, are pivoted at L and L, also to armature K and to A and 13, rerespcctively. XVhcu K is attracted by M M from its lowest position, it has a resultant So movement which raises 13 out of contact with T and projects A into T. \Vhen retracted, as by gravity, its operation is reversed.

Z) is a three-armed bar pivoted at (I, having upon the end of its perpemlicular free arm a fast and loose catch, a.

S S are solenoids of high resistance, having cores D D, pivoted, respectively, at opposite ends of bar 7). One winding, \V, of magnet M M is connected to scrcw-posta. The opposite 3 end is connected to bar A. Mercury-cup T is connected to screw-post One end of XV, the other winding of M M, is carried to artificial resistance R. From the opposite end of It connection is made with screw-post 5. The 5 opposite end of the coil \V is connected to B. llIercury-cup T is connected to post 6.

In Fig. 2, O is a dynamo having its fieldcoils in series with its armature. E is a secondary battery connected todynamo O by main leads 1 2. Lead 1 is divided and the ends are connected to posts 3 and 4, thus including the circuit-breaker. Posts 5 and 6 are connected to main leads 1 and 2 by wires 7 and 8 at a point between the dynamo and the screw-cups 3 and 4. Solenoid S is connected to leads 1 and 2 at the same point by wires 9 and 10. Solenoid S is connected to leads 1 and 2 at a point between the battery and circuit-breaker by wires 11 and 12.

In the drawings, the'dynamo is shown in the operation of charging the battery, circuit being made via elements 0 1 3 Tv A M M 4 to battery, and return by lead 2. Should the dynamo stop or slacken its movement, or

' its electro-motive force fail for any reason, ar-

mature K will leave its attracted position, the bar B will drop into mercury-cup T and simultaneousl y barAwill be elevated and carried out of contact with mercury-cup T. As the shortest contact leaves the mercury, the first section of the resistance a is introduced. As the second contact leaves the mercury,the second section of the resistance is introduced, and so on, the entire resistance being first inserted and the circuit then broken. By this means sparking is avoided. The converse of this is simultaneously taking place at cup T The entire resistaneeris first introduced, this being diminished by sections until 1'' is completely removed and circuit is complete 'via dynamo 1 8 5 It, magnet M M, B, T, 6, 7, and 2. The lead 1 is, however, broken at T. The result of making circuit through R and the second coil of M M would be to attract K and again close the lead 1; but the solenoid S is operated by the electro-motive force of battery in circuit m'ct E 1 12 S 11 2, the result of which is to tilt catch 0 into position to engage with and hold the inner end of that angular bar which is connected to bar A in a depressed position, and to thus retain A in an elevated position. Solenoid S is in circuit with the dynamo via 1, 8, 10, S, 9, 7, and 2. The action of S upon tilting-lever b is opposite to that of S, and when the electro-motive force of the dynamo rises above that of the battery the effect due to S will overcome the eii'ect due to S and the catch 0 will be tilted out of contact with the right-hand lever, which, when released, is immediately carried into position to close the main circuit 1 at AT. Contact at B T is broken and the charging-circuit is again closed.

While the charging-circuit is closed S and S should about balance each other, as both are measuring substantially the same electromotive force.

Resistance B should be suiiicient in amount to compensate for the battery A;

What I claim, and desire to secure by Letters Patent. is-

1. The combination of a dynamo-electric machine and a secondary battery to be charged thereby, a switch or circuit-changer in the charging-circuit, a switch or circuit-changer in a separate circuit, an electro-magnet in the charging-circuit, and an clectro-magnet in the said separate circuit, both said magnets controlling the movements ofthe switch or circuitchanger, a second electro-magnet in the said separate circuit, and an electro-magnet in circuit with the secondary battery, both co-operating to control the movements of the switch or circuit-changer.

2. The combination of a dynamoelectric machine and a secondary battery in electricallyindependent circuits, an electro magnetic coil in the dynamocircnit, an electromagnetic coil in the battery-circuit, and an electromagnetic switch or circuit-changer controlled by the co-operation of the two firstnamed magnetsto electrically unite the battery and dynamo in one circuit.

3. The combination of a dynamo-electric machine and a secondary battery in electrically-independent circuits, an electro magnetic switch or circuit-ehanger for uniting said circuits, and an electromagnetic coil in the battery-circuit operated by variations in electro-motive force to control said switch or circuit-changer.

4. The combination of a dynamo-electric 9 ent closed circuits, one containing the dynamo and resistance and the other the battery.

Signed at London, in the county of'Middlesex, England, this 13th day of August, A. D. 1887. A

JOHN S. SELLON.

Witnesses:

JOHN NEWTON, WM. JOHN WEnKs,

Both of 9 Birchin Lane, London.

IIO 

